"Bernadette's" (Melissa Rauch) father "Mike Rostenkowski" is played by Casey Sander. "Mike" is a retired police officer who takes his old service revolver with him wherever he goes. He is not his son-in-law's biggest fan, but, surprisingly, he gets along very well with "Sheldon" (whom he is able to talk football with).

Casey Sander is well-known in show business. He became a household name when he starred in Home Improvement and Grace. Sanders had countless guest appearances in other popular series such as Malcolm in the Middle, The Mentalist and Rules of Engagement.

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